The seventh collection of "Studies" is published in the year of the 60th anniversary of the head of the Department of Source Studies of the History of the USSR of the pre-October period, Doctor of Historical Sciences, prof. V.I. Buganov, founder of this scientific publication and editor-in-chief of previous issues. Most of the works placed in the collection were made by the students of V.I. Buganov and develops the research he began on important groups and types of sources on the history of feudal Russia. These are reports of new sources on the history of the class struggle in the XVII century, work on the reconstruction of the general composition of embassy books of the late XV - early XVIII centuries, articles devoted to the study of various sources of the XVII century. - about housing lists, about tens, about discharge notebooks. Separately consider rare sources on the history of social thought, ideological struggle in feudal Russia of the XVI-XVII centuries, the history of Kalmykia and Belarus. tells about one interesting archival find. The collection also includes original research on a wide range of scientific topics of the Department. As always, attention is paid to the problems of source study of the period of capitalism in Russia. They are devoted to works on mass sources on the history of reforms of the state village of 1866, on the periodical press of the Yaroslavl province during the First Russian Revolution.